Molecular ruthenium‐based water oxidation catalyst precursors of general formula [Ru(tda)(Li)2] (tda2− is [2,2′:6′,2′′‐terpyridine]‐6,6′′‐dicarboxylato; L1=4‐(pyren‐1‐yl)‐N‐(pyridin‐4‐ylmethyl)butanamide, 1 b; L2=4‐(pyren‐1‐yl)pyridine), 1 c), have been prepared and thoroughly characterized. Both complexes contain a pyrene group allowing ready and efficiently anchoring via π interactions on multi‐walled carbon nanotubes (MWCNT). These hybrid solid state materials are exceptionally stable molecular water‐oxidation anodes capable of carrying out more than a million turnover numbers (TNs) at pH 7 with an Eapp=1.45 V vs. NHE without any sign of degradation. XAS spectroscopy analysis before, during, and after catalysis together with electrochemical techniques allow their unprecedented oxidative ruggedness to be monitored and verified.
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Creus et al. (2016) studied this question.
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